JPH04204893A - Low-frequency sound absorbing panel - Google Patents
Low-frequency sound absorbing panelInfo
- Publication number
- JPH04204893A JPH04204893A JP2337848A JP33784890A JPH04204893A JP H04204893 A JPH04204893 A JP H04204893A JP 2337848 A JP2337848 A JP 2337848A JP 33784890 A JP33784890 A JP 33784890A JP H04204893 A JPH04204893 A JP H04204893A
- Authority
- JP
- Japan
- Prior art keywords
- low
- frequency sound
- sound absorbing
- nonwoven fabric
- absorbing panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 claims abstract description 22
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 15
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 23
- 239000011230 binding agent Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000003822 epoxy resin Substances 0.000 abstract description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 abstract description 2
- 229920000647 polyepoxide Polymers 0.000 abstract description 2
- 239000004926 polymethyl methacrylate Substances 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 abstract 3
- 238000000034 method Methods 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000011162 core material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 241000975357 Salangichthys microdon Species 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 239000012814 acoustic material Substances 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- -1 alkyl silicate Chemical compound 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920006332 epoxy adhesive Polymers 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000004005 microsphere Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、低周波音吸音パネルに関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a low frequency sound absorption panel.
さらに詳しくは、低周波音（１２５〜１０００Ｈｚ）に
対して、顕著な吸音効果を有し、かつ、軽量でもある新
規な吸音パネルに関するものである。More specifically, the present invention relates to a novel sound-absorbing panel that has a remarkable sound-absorbing effect on low-frequency sounds (125 to 1000 Hz) and is also lightweight.
（従来技術とその課題）
従来より、各種の吸音パネルが開発され、すでに実用化
されているものも少くない。たとえば各種の素材からな
る多孔質板が、あるいは弾性材等からなるパネルが使用
されてきてもいる。(Prior art and its problems) Various sound absorbing panels have been developed in the past, and many of them have already been put into practical use. For example, porous plates made of various materials or panels made of elastic materials have been used.
そして、この発明者らによりすでに特許出願済みの発明
において、従来のグラスウール、アルミニウム発砲体等
の吸音材では難かしかった、低周波音の吸音に優れた吸
音パネルが提案されている。In an invention for which a patent application has already been filed by the inventors, a sound-absorbing panel has been proposed that is excellent in absorbing low-frequency sounds, which is difficult to do with conventional sound-absorbing materials such as glass wool and aluminum foam.
この吸音パネルは、セラミック粒子を基材として成形し
た多孔質板を金属繊維不織布に積層一体化してなること
を特徴としており、その低周波における吸音効果には特
筆すべきものがあった。This sound-absorbing panel is characterized by being made by laminating a porous plate formed from ceramic particles as a base material onto a metal fiber non-woven fabric, and its sound-absorbing effect at low frequencies is noteworthy.
しかしながら、これらの提案にもかかわらず、さらに高
性能の低周波音の吸音板に対するニーズは強く、この低
周波音の吸音性に優れたパネルの実現が強く望まれてい
た。However, despite these proposals, there is still a strong need for a low-frequency sound absorbing board with even higher performance, and it has been strongly desired to realize a panel with excellent low-frequency sound absorption properties.
このため、この発明は、このような要請に答えるものと
してなされたものであり、従来提案の吸音パネルの緒特
性を低下させることなく、さらに低周波音の吸音性に優
れ、かつ、軽量で、施工性も良好な新しい吸音パネルを
提供することを目的としている。Therefore, the present invention has been made in response to these demands, and provides a sound absorbing panel that is lightweight, has excellent low-frequency sound absorption properties, and has excellent low-frequency sound absorption properties without deteriorating the characteristics of the conventionally proposed sound absorbing panels. The aim is to provide a new sound-absorbing panel that is easy to install.
（課題を解決するための手段）
この発明は、上記の課題を解決するものとして、中空お
よび／または多孔質セラミック粒子を分散硬化させた多
孔質板を金属繊維不織布に積層一体化してなることを特
徴とする低周波音吸音パネルを提供する。(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a structure in which a porous plate in which hollow and/or porous ceramic particles are dispersed and hardened is laminated and integrated with a metal fiber nonwoven fabric. Provides a low-frequency sound absorption panel with special characteristics.
この場合のセラミック粒子としては、着色あるいは無着
色のいずれのものであってもよい。多孔質のセラミック
粒子としては、一般的なセラミックス原料としての粘土
類や顔料と発泡性骨材（シラス、抗火石等）、または、
有機樹脂（ＰＥ、ポリスチレン等）チップ等と混練し、
焼成して得られたものを用いることができる。The ceramic particles in this case may be colored or uncolored. Porous ceramic particles include clays and pigments as general ceramic raw materials and foaming aggregates (whitebait, anti-firestone, etc.), or
Knead with organic resin (PE, polystyrene, etc.) chips, etc.
Those obtained by firing can be used.
また、中空のセラミック粒子としては、公知の方法とし
て、芯材溶融法や溶融吹付法等によって製造したものを
用いることができる。Further, as the hollow ceramic particles, those manufactured by a known method such as a core melting method or a melt spraying method can be used.
溶融吹付法は、中空微小球体の原料素材を融解し、その
粘性と表面張力を利用して、空気ジェットによって空気
泡を内包させて球殻体を形成する方法である。また、芯
材溶融法は、小直径の球体または固体の芯材の周囲に、
中空小球体の材質を壁膜状に形成させ、融解または加熱
分解によって芯材を除いて中空小球体を形成する方法で
ある。The melt-spraying method is a method in which a raw material for hollow microspheres is melted, and using its viscosity and surface tension, air bubbles are encapsulated by an air jet to form a spherical shell. In addition, the core melting method uses a small-diameter sphere or a solid core material.
This is a method in which the material of the hollow spherules is formed into a wall film shape, and the core material is removed by melting or thermal decomposition to form the hollow spherules.
このいずれの方法によって製造した中空セラミック粒子
も、この発明において有効に使用することができる。Hollow ceramic particles produced by any of these methods can be effectively used in the present invention.
このような中空および／または多孔質な着色／無着色の
セラミック粒子の形状については、球状、板状、柱状、
その他不定形、あるいは表面凹凸を有するもの等任意と
することができる。粒径については、一般的には０．３
〜４．Ｏｎ＋ｍの範囲のものを好ましく使用することが
できる。また、この範囲程度のものを全体の７０％以上
含む場合には特に優れた吸音効果が得られる。The shapes of such hollow and/or porous colored/uncolored ceramic particles include spherical, plate-like, columnar,
It can also be of any other shape, such as an amorphous shape or one with surface irregularities. Regarding particle size, generally 0.3
~4. Those in the range of On+m can be preferably used. In addition, particularly excellent sound absorbing effects can be obtained when 70% or more of the total content is within this range.
この中空および／または多孔質のセラミック粒子は、要
求性能、用途に応じて、厚さ３ｍｍから３０ｍｍ程度の
板状多孔質板に成形して、金属繊維不織布と一体化させ
るが、この板状多孔質板への成形方法としては、エポキ
シ樹脂、ＰＭＭＡ、アクリル樹脂、ウレタン樹脂、不飽
和ポリエステル樹脂等の有機バインダーおよび／または
アルカリシリケート、アルキルシリケート等の無機バイ
ンダーと重量比で、セラミック／バインダー＝３／１−
１２／ｌの割合で混合し、金属繊維不織布の上または下
で成形、個化させ、そのまま一体化させて多孔質板とす
ることができる。この場合、あらかじめ、中空および／
または多孔質なセラミック粒子をバインダーとともに板
状に成形し、個化させたものを接着剤にて金属繊維不織
布と接合してもよい。These hollow and/or porous ceramic particles are formed into a plate-like porous plate with a thickness of about 3 mm to 30 mm, depending on the required performance and application, and are integrated with the metal fiber nonwoven fabric. The method for forming a quality plate is to use an organic binder such as epoxy resin, PMMA, acrylic resin, urethane resin, or unsaturated polyester resin, and/or an inorganic binder such as alkali silicate or alkyl silicate in a weight ratio of ceramic/binder = 3. /1-
They can be mixed at a ratio of 12/l, molded and individualized on or under the metal fiber nonwoven fabric, and then integrated as they are to form a porous plate. In this case, the hollow and/or
Alternatively, porous ceramic particles may be formed into a plate shape together with a binder, and the individual particles may be bonded to a metal fiber nonwoven fabric using an adhesive.
他の方法としては、セラミック粒子を、生の状態（焼成
前）で加圧して、または有機、無機のバインダーにより
所定の形状に成形した後に、焼成し、セラミック粒子を
相互融着させ、セラミックの多孔質板を作成し、接着剤
にて金属繊維不織布と一体化させることもできる。Another method is to press the ceramic particles in their raw state (before firing) or to mold them into a predetermined shape using an organic or inorganic binder and then fire them to fuse the ceramic particles together. It is also possible to create a porous plate and integrate it with the metal fiber nonwoven fabric using an adhesive.
いずれの方法を採用するかについては、その用途によっ
て適時法めることができる。また、上記セラミックス粒
子を基材とする多孔質板の気孔率は、３０〜７０％程度
とするのが好ましい。この場合、気孔率の中には、粒子
内の気孔も当然含まれる。中空および／または多孔質の
セラミック粒子を使用した場合、特に気孔率が３５〜５
５％になるように成形された多孔質板の吸音効果は著し
く向上する。Which method to adopt can be determined at any time depending on the intended use. Further, the porosity of the porous plate using the ceramic particles as a base material is preferably about 30 to 70%. In this case, the porosity naturally includes pores within the particles. If hollow and/or porous ceramic particles are used, the porosity may be between 35 and 5.
The sound absorption effect of a porous plate formed to have a porous thickness of 5% is significantly improved.
また、金属繊維不織布としては、アルミニウム、アルミ
ニウム合金、銅、チタン、ニッケル、コバルト、鉄等の
金属またはその合金による繊維不織布とすることができ
る。なかでも、その軽量性等の点からアルミニウムまた
はアルミニウム合金が特に好ましいものでもある。Further, the metal fiber nonwoven fabric may be a fiber nonwoven fabric made of metal such as aluminum, aluminum alloy, copper, titanium, nickel, cobalt, iron, or an alloy thereof. Among these, aluminum or aluminum alloy is particularly preferred from the viewpoint of its light weight.
以下、実施例を示し、さらに詳しくこの発明の低周波音
吸音パネルについて説明する。Hereinafter, examples will be shown and the low frequency sound absorbing panel of the present invention will be explained in more detail.
実施例
芯材溶融法で作成した粒径０．５〜３．０ｍｍ、見かけ
（絶乾時）比重１．３の中空セラミック粒子８重量部に
対して、ケイ酸ソーダ（水ガラス）に硬化剤を加えたも
のを１重量部の割合で混合し、型枠に投入して、厚さ７
＋ｎｍの板状多孔質板に成形して硬化させた。硬化後
、エポキシ系接着剤にて、アルミニウム繊維不織布（厚
さ３ ｍｒｎ、 ３０００ｇ／ ｒｒ？）と接着、一体
化させた。Example: For 8 parts by weight of hollow ceramic particles with a particle size of 0.5 to 3.0 mm and an apparent (absolutely dry) specific gravity of 1.3, prepared by a core melting method, a hardening agent was added to sodium silicate (water glass). Mix 1 part by weight of 1 part by weight, put it into a mold, and form it to a thickness of 7.
It was molded into a +nm plate-like porous plate and cured. After curing, it was bonded and integrated with an aluminum fiber nonwoven fabric (thickness: 3 mrn, 3000 g/rr?) using an epoxy adhesive.
この吸音パネルの気孔率は、５５％であった。The porosity of this sound-absorbing panel was 55%.
この低周波音パネルについて残響家法吸音率を測定した
結果を示したものが第１図のＥである。E in FIG. 1 shows the results of measuring the reverberant sound absorption coefficient of this low-frequency sound panel.
また比較例としてこの発明の発明者らがすでに提案した
吸音板（粒径０．５〜３．０咽セラミック粒子の層（厚
さｔ ＝ ７ ｍｍ） ）とアルミニウム繊維不織布（
厚さｔ ＝ ３ ｍｍ、３０００ ｇ ／ポ）とを積層
一体化したもの（Ａ）、アルミニウム繊維不織布（１〜
３ｍｍ、３０００ ｇ ／ポ）のみのパネル（Ｂ）、吸
音タイル（Ｃ）、およびガラスファイバー吸音材（Ｄ）
の場合についてもその吸音率を第１図に示した。In addition, as a comparative example, a sound absorbing plate (a layer of ceramic particles with a particle size of 0.5 to 3.0 mm (thickness t = 7 mm)) and an aluminum fiber nonwoven fabric (
Thickness t = 3 mm, 3000 g/po) (A), aluminum fiber nonwoven fabric (1~
3 mm, 3000 g/po) only panel (B), acoustic tiles (C), and glass fiber acoustic material (D)
Figure 1 also shows the sound absorption coefficient in the case of .
第１図からも明らかな通り、この発明の低周波音吸音パ
ネルは従来のものに比較して、低周波音について顕著な
吸音性能を示している。As is clear from FIG. 1, the low-frequency sound absorbing panel of the present invention exhibits remarkable sound-absorbing performance for low-frequency sounds compared to conventional panels.
（発明の効果）
以上、詳しく説明したように、この発明により低周波音
の吸音率が著しく高い吸音パネルを得ることができる。(Effects of the Invention) As described above in detail, the present invention makes it possible to obtain a sound absorbing panel with a significantly high sound absorption coefficient for low frequency sounds.
また、耐熱性、耐候性、意匠性に加え、吸音パネルを軽
量化することができ、施工性をも著しく向上させること
が可能となる。Furthermore, in addition to heat resistance, weather resistance, and design, the sound-absorbing panel can be made lighter and its workability can be significantly improved.
第１図は、この発明の吸音パネルの吸音性能を、比較例
とともに示した波長−吸音係数の相関図である。FIG. 1 is a wavelength-sound absorption coefficient correlation diagram showing the sound absorption performance of the sound absorption panel of the present invention together with a comparative example.
Claims (3)
硬化させた多孔質板を金属繊維不織布に積層一体化して
なることを特徴とする低周波音吸音パネル。(1) A low-frequency sound absorbing panel comprising a porous plate in which hollow and/or porous ceramic particles are dispersed and hardened, and a metal fiber nonwoven fabric is laminated and integrated with the porous plate.
るものが少なくとも７０％多孔質板中に含まれているこ
とを特徴とする請求項（１）記載の低周波音吸音パネル
。(2) The low-frequency sound absorbing panel according to claim (1), wherein the porous plate contains at least 70% of ceramic particles having a particle size of 0.3 to 4.0 mm.
徴とする請求項（１）記載の低周波音吸音パネル。(3) The low-frequency sound absorption panel according to claim (1), wherein the porous plate has a porosity of 30 to 70%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2337848A JP3038005B2 (en) | 1990-11-30 | 1990-11-30 | Low frequency sound absorbing panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2337848A JP3038005B2 (en) | 1990-11-30 | 1990-11-30 | Low frequency sound absorbing panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04204893A true JPH04204893A (en) | 1992-07-27 |
| JP3038005B2 JP3038005B2 (en) | 2000-05-08 |
Family
ID=18312547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2337848A Expired - Fee Related JP3038005B2 (en) | 1990-11-30 | 1990-11-30 | Low frequency sound absorbing panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3038005B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0911361A (en) * | 1995-07-03 | 1997-01-14 | Mitsubishi Heavy Ind Ltd | Curved surface ceramic sound-absorbing material and its manufacture |
| EP0851402A2 (en) * | 1996-12-26 | 1998-07-01 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Light-weight ceramic acoustic absorber and method of manufacturing the same |
| JP2007186410A (en) * | 2005-12-16 | 2007-07-26 | Mino Ceramic Co Ltd | Air permeable porous body and gas purifying column |
-
1990
- 1990-11-30 JP JP2337848A patent/JP3038005B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0911361A (en) * | 1995-07-03 | 1997-01-14 | Mitsubishi Heavy Ind Ltd | Curved surface ceramic sound-absorbing material and its manufacture |
| EP0851402A2 (en) * | 1996-12-26 | 1998-07-01 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Light-weight ceramic acoustic absorber and method of manufacturing the same |
| EP0851402A3 (en) * | 1996-12-26 | 2000-12-20 | Ishikawajima-Harima Heavy Industries Co., Ltd. | Light-weight ceramic acoustic absorber and method of manufacturing the same |
| JP2007186410A (en) * | 2005-12-16 | 2007-07-26 | Mino Ceramic Co Ltd | Air permeable porous body and gas purifying column |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3038005B2 (en) | 2000-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4094380A (en) | Multi layer sound-proofing structure | |
| CN100487146C (en) | Foam metal and preparation method thereof | |
| CN105658881A (en) | Concrete element comprising a sound-absorber | |
| US3056707A (en) | Sound deadener and absorber | |
| US6090478A (en) | Sound absorbing/shielding and electric wave absorbing plastic sheet containing encapsulated magnetic fluid, and sound absorbing/shielding and electric wave absorbing plastic panel | |
| GB2064988A (en) | Sound-damping mat or drape and method of manufacture thereof | |
| US5516592A (en) | Manufacture of foamed aluminum alloy composites | |
| JPH04204893A (en) | Low-frequency sound absorbing panel | |
| JP2010002617A (en) | Sound absorbing material and method of manufacturing the same | |
| US5820975A (en) | Sound absorbing material and method of production therefor | |
| JP4906318B2 (en) | Low frequency sound absorber made of closed cell glass foam | |
| CN210713611U (en) | Sound-absorbing honeycomb material decorative plate | |
| CN108911689A (en) | A kind of sound-absorbing material | |
| JPH04266942A (en) | Porous material and sound-absorbing panel | |
| JP3213241B2 (en) | Plastic sheet material containing magnetic fluid-encapsulated capsule for sound absorbing and insulating and radio wave absorbing and plastic panel for sound absorbing and insulating and radio wave absorbing | |
| JPH10121598A (en) | Sound absorption material and its manufacture | |
| JPH04305048A (en) | Inorganic soundproof material and production thereof | |
| JP3636351B2 (en) | Method of manufacturing sound-absorbing and sound-insulating composite plastic panel containing magnetic fluid inclusion capsule | |
| JPH07144977A (en) | Sound-absorbing composite compact and its production | |
| KR20100033009A (en) | Composite panel using paraboard and bubble aluminum | |
| JPS6227216B2 (en) | ||
| JPH09194270A (en) | Inorganic sound absorbing material and laminated soundproofing material | |
| JPS6026149B2 (en) | Manufacturing method of sound absorber | |
| JPS594026Y2 (en) | lightweight fireproof board | |
| CN2275609Y (en) | Pozzolan pumice stone composite foaming board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |